Mark Andrews wrote:
>> There is no workaround available, but systems which are not authoritative
>> servers for DNSSEC signed zones are not affected by the first issue; and
>> systems which do not permit untrusted users to perform recursive DNS
>> resolution are not affected by the second issue.  Note that the default
>> configuration for named(8) in FreeBSD allows local access only (which on
>> many systems is equivalent to refusing access to untrusted users).
> 
>       From ISC's advisary (which I authored).
> 
> Workaround:
> 
>         Disable / restrict recursion (to limit exposure).

Considering that the only FreeBSD systems which permit recursive queries are
those which have been specifically configured to do so, I don't consider this
to be a workaround.  DoS by administrator is no better than DoS by attacker.

Colin Percival

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